.app-container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.nav-bar {
  background-color: #ffffff;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
}

.nav-brand {
  font-size: 1.5rem;
  font-weight: bold;
  color: #4a90e2;
}

.nav-links {
  display: flex;
  gap: 1.5rem;
}

.nav-links a {
  color: #666;
  text-decoration: none;
  padding: 0.5rem 1rem;
  border-radius: 4px;
  transition: all 0.3s ease;
}

.nav-links a:hover {
  color: #4a90e2;
  background-color: rgba(74, 144, 226, 0.1);
}

.nav-links a.active {
  color: #4a90e2;
  background-color: rgba(74, 144, 226, 0.1);
}

.main-content {
  flex: 1;
  padding: 5rem 2rem 2rem;
  background-color: #f5f5f5;
}

/* 响应式设计 */
@media (max-width: 480px) {
  .nav-bar {
    padding: 1rem;
  }

  .nav-brand {
    font-size: 1.2rem;
  }

  .nav-links {
    gap: 1rem;
  }

  .nav-links a {
    padding: 0.4rem 0.8rem;
  }

  .main-content {
    padding: 4.5rem 1rem 1rem;
  }
}